A Whole New Cooling Experience. The ChilledDoor® Rack Cooling System isn’t just a way to remove 100% of the heat from your server rack, it’s a way to change the. In a sense, the servers, walls, etc. act as thermal sponges during a cooling outage and return the heat after cooling is restored. 4 For information on the different types of cooling systems, see White Paper 59, The Different Technolo-…